ABSTRACT
When trying to listen to someone in a noisy crowd people can often perceive more if they watch the speaker. In addition, many people can understand more than they expect from a television screen when the sound is turned off. This is done through what is commonly known as lipreading. In fact much of what is called 'lipreading' relies on context, facial expression, gestures and other non-verbal cues. For this reason the more general term 'speechreading' is often preferred.
